Determination of total chromium by flame atomic absorption spectrometry after coprecipitation by cerium (IV) hydroxide

Abstract

A method for the preconcentration of the total chromium based on coprecipitation with cerium (IV) hydroxide is proposed for determination of chromium by flame atomic absorption spectrometry. Different factors including carrier element amount, pH, sample volume and matrix ion effects for the precipitation were examined. The detection limit of the total chromium (k=3, N=15) was 0.18 microg l(-1). The presented method was applied for the determination of chromium in the wastewater samples from Kayseri and Nigde Organized Industrial Region-Turkey and in drinking water from our laboratory, Kayseri with satisfactory results (relative standard deviations below 8%, recoveries 95%). The analytical results obtained by the proposed method for certified copper sample was in good agreement with the certified value.

3-Ethyl-4-(p-chlorobenzylidenamino-4,5-dihydro-1H-1,2,4-triazol-5-one (EPHBAT) as precipitant for carrier element free coprecipitation and speciation of chromium(III) and chromium(VI)

“…A comparison of the presented procedure and some recent speciation procedures for Cr(III) and Cr(VI) in the literature were given in Table 6. The detection limits and preconcentration factors are superior than some of the preconcentration/separation techniques [30,[47][48][49][50][51][52][53][54][55][56][57]. This method is very simple, rapid and low cost.…”

Thulium hydroxide: A new coprecipitant for speciation of chromium in natural water samples

“…Quantitative recoveries for the analytes have been generally obtained for the analytes in the recent hydroxide coprecipitation works at the basic pH values [28,32,36]. Because of these points, the influences of the pH of the model solutions on the quantitative recoveries of chromium species on the thulium(III) hydroxide coprecipitation system were investigated in the pH range of 7.0-14.0.…”

“…Analyte ions could be precipitated in the procedure with the combination of a carrier element and a suitable chelating agent [27][28][29]. Studies on chromium speciation by coprecipitation using various reagents have been suggested by the researchers [30][31][32][33].…”

Bi̇r Elektroki̇myasal İşleme Uygulamasinda Atik Elektroli̇tte Bakir İyonu (Cu2+) Tayi̇ni̇ Ve Aritimi

“…Eser miktarda metal iyonlarının tayin edilip arıtılmasında kullanılan yöntemlerin amacı, daha düşük analit derişimlerinin tayin edilebilmesi ve analitin matriks bileşenlerinden etkin bir biçimde ayrılmasıdır. Su ve sulu çözeltilerden ağır metal ve/veya metal iyonlarını arıtmak için kullanılan başlıca yöntemler i) iyon değiştirme yöntemi [4], ii) sıvı-sıvı ekstraksiyonu [5], iii) çöktürme [6] ve iv) yüzdürme [7] olarak sıralanabilir.…”